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ANN HAVEN MORGAN 



intervals between stimulations. Cocained and normal feet were 

 alternately stimulated by water increasing in heat by 1° at a 

 time from 30°C. to 50°C. (table 4). The first reaction of the 

 cocained foot was at 4o°C. after a reaction interval of 24 seconds, 

 but the first response of the normal one was at 40°C. after a 

 reaction interval of 5 seconds. The average degree of first re- 



TABLE 4 



Responses in seconds to heat increasing by 1°C. at each stimulation. Right foot 



cocained 30 minutes. Left foot normal. Reaction alloivance 30 seconds. 



Stimxdation time, 2 minutes. ^ = no response 



sponse for the cocained foot was 45°C. after an average reaction 

 time of 21.75 seconds. For the normal foot the average first 

 response was at 40°C. after an average reaction interval of 

 4.5 seconds (table 4). 



Following this twelve more frogs were tested by similar meth- 

 ods, but with the stimulations beginning at 15°C. and continu- 

 ing by 5°C. intervals to 45°C. (table 5). Since no responses 

 were secured, the lower degrees 15°C. to 30°C. have not been 



